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What causes rocks in a stream to be smooth?
Earthquakes
Volcanoes
Weathering
Movement of fish

What causes rocks in a stream to be smooth?
Earthquakes
Volcanoes
Weathering
Movement of fish

What causes rocks in a stream to be smooth?
Earthquakes
Volcanoes
Weathering
Movement of fish

What causes rocks in a stream to be smooth?
Earthquakes
Volcanoes
Weathering
Movement of fish